They have a deeper team than they've ever had. It's a lot deeper than even when Tuchel was manager. Passlack is the only one of those players who isn't in our top 10 most used players this season. The problem isn't that he rotated players; it's that he used the same players, and moved Can forward to a role where his bad passing is more of an issue, especially against a very defensive opponent where creativity is demanded. They actually have good and creative backups in these roles, but Favre didn't choose them today. Dahoud was rested. Morey can barely sniff the field no matter how much and how badly Meunier plays.
The only thing I'll defend is that I don't know what the other option is. I agree that Passlack isn't Dortmund quality. He can't complete a 10 yard pass with consistency, but Guerreiro is injured. What else are you going to do? One of the many bad alternatives, Schmelzer, is injured. You could use Schulz, but is he really any better than Passlack? I think right-footed Passlack is better.
You could have tried a back 3 where Hazard plays LWB, or you could use Morey at LB, but I'm also not sure Morey has ever played LB. Guerreiro, who I have criticized a lot, has been brilliant this season. We lose a lot when he's injured. The drop off from our starter to next best option at that position is the biggest drop off in the squad, in my opinion.
Schulz was supposed to solve this problem of another option at that position, but this is among Zorc's worst ever transfers. Schulz was a complete Nagelsmann product. Next season an alternative at that position has to be figured out. We can't go into next season without another natural option there. And I completely agree about Morey vs. Meunier, but I mention it all the time and don't need to belabor the point further.